Electric hoist



(No Model.) b 2 Sheets-8heet 2.- J. A. LOUNSBURY. ELECTRIC HOIST.

o. 580,457. PtntedApr. 13, 1897.

JAMES A. LOUNSBURY, OF CHICAGO, ILLINOIS.

ELECTRIC HOIST.

SPECIFICATION forming part of Letters Patent No. 580,457, dated April13,1897.

Application filed July 13,1896. Serial No. 598,968. (No model.)

To aZZ whom it may concern:

Be it known that 1, JAMES A. LOUNSBURY, of Chicago, Illinois, haveinvented certain new and useful Improvements in Electric Hoists, ofwhich the following is a specification.

My invention relates to certain improvements in electric hoists, and hasfor its principal object a construction whereby 'a compact and powerfulengine of this class is provided.

The novel features of this invention relate, first, to the constructionof the frame whereby the field-magnets of the motor and the bearings fora counter-shaft and the sheave or pulley shaft are provided in the samecasting; second, to a novel combination and arrangement of the gearing,including a wormgear driven from the armature-shaft and differentialsheaves mounted upon the sheaveshaft and driven by the worm.

In the accompanying drawings, Figure 1 is a front elevation, and Fig. 2a side elevation.

Inthe drawings, 3 represents the motorframe, which is of annular formand which is provided on its upper surface with the swivel-hook 4:.

5 represents a casting of spider form which is secured to the front ofthe annular body 3, and 6 is a casting to be secured to the rear sidethereof. The castings 5 and 6 afford bearings for the armature-shaft 7.

8 is the armature, and 9 the field-magnets, which are cast integral withthe annular body portion. The body 3 has a narrow neck-like extension10, providing a bearing for a c0unter-shaft 11, and a terminal portion12, of cylindrical form, apertured to provide a bearing for thesheave-shaft 13. The terminal portion 12 has likewise a semicircularperipheral enlargement 1 L, )rovidin g an oil-pocket for a wor1nwheel15, mounted on the sheaveshaft 13. The armature-shaft 7 carries thepinion 16, in mesh with gear 17 of the shaft 11, and the latter has theworm 18, which drives the Worm-gear 15. On the sheave-shaft are mountedthe sheaves 19 and 20, of unequal diameter and constituting differentialsheaves over which are passed the turns of the hoisting-chain 21. Thechain is also passed around the hoisting-pulley 22, j ournaled in thepulleyframe 23, which has the usual grapple. The chain passes from thepulley 22 over the sheave 19 from the front, and from the rear side ofthe pulley 19 the chain passes over the sheave 20 also from the front,and thence from the rear of the said sheave to the pulley 22, the actionbeing that when the load is lifted the sheave-shaft is revolved in adirection to pay out the hoisting-chain from the sheave 19 and to windit up on the sheave 20 at a higher rate corresponding to theirdifference in size, and thereby the speed of hoistin g is reduced andthe lifting power increased.

From the foregoing description it is seen that the bearings for theseveral shafts may be kept in perfect alinement and that the frame,while of simple construction, will afford the maximum strength of thematerial employed.

The arrangement of the gearing is such that the power is effectivelyemployed upon the sheave-shaft. The engine is calculated to giveapproximately four hundred revolutions of the counter-shaft for twelvehundred revolutions of the armature-shaft.

The engine, provided with a motor of one and one-half horse-power, has ahoisting capacity of three tons and a hoisting speed of about four feetper minute, while the total weight of the apparatus does not exceed twohundred and fifty pounds.

It is obvious from the foregoing statements.

that my invention provides an easily-port able hoist of great power.

Certain accessories, such as caps to inclose the motor, may be added.While the structural details may be varied, I have found theconstruction hereinabove described the most desirable.

1. In an electric hoist a motor-frame of annular form having an integralextension or neck; providing a bearing for a counter-shaft and aterminal portion providing a bearing for a sheave-shaft, substantiallyas described.

2. In an electric hoist a motor-frame of annular form havinginwardly-projecting integral lugs constituting field-magnets, a spidersecured to the front of said frame and affordin g a bearing for thearmature-shaft; an integral neck affording a bearing for a countershaftand a terminal portion in Which is pro- Vided a bearing for asheave-shaft, substantially as described.

3. In an electric hoist, a motor-frame of annular form having anintegral neck affording a shaft-bearing and a terminal portion providinga shaft-bearing at right angles to that of the neck and provided with aperipheral enlargement affording an oil-pocket for Worm- 1o gear,substantially as described.

4. In an electric hoist the combination with an electric motor, of acounter-shaft arranged parallel to the shaft of said motor and providedwith a Worm, a sheave-shaft having differential sheaves thereon and aWorm-wheel 15 driven by the Worm on the counter-shaft, substantially asdescribed.

JAMES A. LOUNSBURY.

Witnesses:

FREDERICK O. GOODWIN, A. J. PRATT.

